Here you can request to determine the cause of the damage. You can view the requests of other users and sort them according to the selected criteria. In addition, you can get information about your request, and you can follow the progress of its current state. If your application was not approved, it had probably been because it was impossible to identify the damage based on the sent photos or because the application does not address our topic - determining the pests of trees and shrubs. We will inform you about the status of your application by email.
Visible on multiple tree species, cannot identify for sure but looks like spruce (but also species with flat needles). Observed on both the sunny and shady slopes of the mountain valleys. Old growth trees affected (whole trees observed with needles fallen off).
Answer
Thank you for your request. Unfortunately, determinig the exact cause of this damage is not easy. Your pictures shows a different species, and while each may contribute to the tree defoliation, it´s challenging to pointout the primary reason of this problem. If you are still interested in determining the reason of this problemme, I recommend taking some more pictures of the damaged areas, particulary defoliated branches, larvae or some other more visible symptoms. With best regards Milan Zubrik
Thank you for your inquiry. This is Erysiphe platani, a fungus commonly known as plane tree powdery mildew or sycamore powdery mildew. It is an invasive species in Europe. While it typically does not cause serious problems, severe attacks can lead to tree decline and reduced plant vigor. Common fungicides may help, but repeated applications are often necessary. With best regards, M. Zubrik.
Hello, I have a problem with the gales in the images! I thought it could be Dryomyia circinans, but after a while the adults appeared, they are clearly Hymenoptera. Can you help me with some suggestions?
I also have another type of gale, I am sending a new message. Thank you!
Answer
Dear Ana, thank you for your question. Yes, galls on the leaves looks like those caused by Dryomyia circinans. However, I see at least one gall that belongs to Neuroterus lanuginosus, which is Hymenoptera. The wasp on your picture is definitively not a Neuroterus species. I do not know, what a species it is. Maybe some prasitoids or some another gall wasp... Best ragards M. Zubrik
Dear Ana, thank you for your inquiry. Identifying this hairy object is no easy task, but it appears to resemble a gall. There are several insect species that induce galls on oak trees. Generally, they belong to two groups: hymenoptera and diptera. This particular specimen resembles a gall induced by the Hymanoptera species a gall wasp, Neuroterus lanuginosus. However, it cannot be ruled out that other factors may be responsible, as the symptoms are not unequivocal. Wishing you a pleasant day, Milan Zubrik https://www.forestpests.eu/pest/neuroterus-lanuginosus
